<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>DOM 1</title>
    <style>
        .red{
            background:red ;
        }
    </style>
</head>
<body>
    示例
    <div>
        <div id="test"><span>test1</span>
            <p class="red">段落标签3</p>test2
        </div>
        <div id="test2"><span>test1</span>
            <p class="red">段落标签3</p>test2
        </div>
    </div>

    <div id="empty">
        <div id="e1"></div>
        <div id="e2"></div>
        <div id="e3"></div>
    </div>
    <div id="siblings">
        <div id="s1"></div>
        <div id="s2"></div>
        <div id="s3"></div>
    </div>
    <div id="travel">
        <div id="t1">t1</div>
        <div id="t2">t2</div>
        <div id="t3">t3</div>
    </div>

    <script src="dom.js"></script>
    <script src="main.js"></script>
</body>
</html>